CN214541526U - Pixel circuit and display device - Google Patents
Pixel circuit and display device Download PDFInfo
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- CN214541526U CN214541526U CN202120814162.4U CN202120814162U CN214541526U CN 214541526 U CN214541526 U CN 214541526U CN 202120814162 U CN202120814162 U CN 202120814162U CN 214541526 U CN214541526 U CN 214541526U
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Abstract
A pixel circuit and a display device include a main control circuit, a repair circuit, and a power supply, wherein the main control circuit controls whether a first light emitting element emits light, and the power supply supplies power to the main control circuit and the repair circuit. The repair circuit comprises a plurality of thin film transistors, a first capacitor and a second light-emitting element, the thin film transistors are electrically connected with the main control circuit, and when the first light-emitting element emits light, the power supply charges the first capacitor; when the first light-emitting element does not emit light, the first capacitor discharges to enable one of the thin film transistors to be conducted, and the power supply supplies power to the second light-emitting element to enable the second light-emitting element to emit light. Through setting up above-mentioned repair circuit in pixel circuit, when first light emitting component was not luminous, a plurality of thin-film transistors and first electric capacity combined action switched pixel circuit to repair circuit to make the second light emitting component luminous, the dark spot problem that produces when having solved first light emitting component trouble, and need not external action and can accomplish automatic switch-over, promoted repair efficiency greatly.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a pixel circuit and display device.
Background
The Micro-LED is formed by thinning, microminiaturizing and arraying an LED structure, the size is reduced to about 1-10 mu m, a protective layer and an electrode are completed by physical deposition after the LED structure is transferred onto a substrate in a large quantity, and then the Micro-LED is packaged to complete the display of the Micro-LED. The Micro-LED display has good stability and long service life, simultaneously has the advantages of low power consumption, high color saturation, high reaction speed, strong contrast and the like of the LED, and has wide application in the fields of wearable equipment, ultra-large display screens, wireless optical communication and the like. In the manufacturing process of the Micro-LED display panel, the LED chips need to be transferred from the respective growth substrates to the display panel. However, if any one of the LED chips is damaged or has poor contact, a bad point will appear on the display panel after transferring, which affects the imaging effect.
At present, the pixel circuit is mainly repaired by adopting laser repairing or IC switching, however, the repairing quantity increases exponentially with the increase of the giant transfer area by adopting the laser repairing mode, so that the repairing difficulty is too large for products with higher resolution.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing deficiencies of the prior art, an object of the present application is to provide a pixel circuit and a display device, which can automatically repair a dead pixel in a mass transfer process, thereby greatly improving the repair efficiency.
The present application provides a pixel circuit, including: a main control circuit for controlling whether the first light emitting element emits light; the repair circuit comprises a plurality of thin film transistors, a first capacitor and a second light-emitting element, the thin film transistors are electrically connected with the main control circuit, the main control circuit is used for charging the first capacitor, and the first capacitor is used for discharging one of the thin film transistors; and a power supply for supplying power to the main control circuit and the repair circuit; when the first light-emitting element emits light, the power supply charges the first capacitor through the main control circuit; when the first light-emitting element does not emit light, the first capacitor discharges to control one of the thin film transistors to be turned on, and the power supply supplies power to the second light-emitting element through the plurality of thin film transistors so as to enable the second light-emitting element to emit light.
Through set up the repair circuit in pixel circuit, and the repair circuit includes a plurality of thin film transistors, first electric capacity and second light emitting component, when first light emitting component is not luminous, a plurality of thin film transistors and first electric capacity combined action switch pixel circuit to the repair circuit, so that the second light emitting component is luminous, thereby solved the dark spot problem that the huge transfer in-process produced because first light emitting component trouble, and need not external action and can accomplish automatic switch-over, promoted the repair efficiency greatly.
In one embodiment, the plurality of thin film transistors include a first thin film transistor, the first thin film transistor includes a first control terminal, a first current input terminal and a first current output terminal, the first control terminal is configured to control whether the first thin film transistor is turned on, the first current input terminal is electrically connected to the power supply, the first current output terminal is connected to the first capacitor, and when the first thin film transistor is turned on, the power supply charges the first capacitor through the first thin film transistor. The first thin film transistor is arranged in the repair circuit and is switched on or off according to the light emitting state of the first light emitting element so as to connect or disconnect the first capacitor with or from the main control circuit, so that the purpose that when the first light emitting element emits light, the first capacitor is charged by a power supply, and when the first light emitting element does not emit light, the first capacitor is discharged so as to enable the second light emitting element to emit light, and the pixel circuit is repaired is achieved.
In one embodiment, the plurality of thin film transistors further include a second thin film transistor, the second thin film transistor includes a second control terminal and a second current output terminal, the second control terminal is connected to the first capacitor, the second current output terminal is connected to the second light emitting element, the second thin film transistor has a voltage threshold, and when a voltage between the second control terminal and the second current output terminal is greater than the voltage threshold, the second thin film transistor is turned on to make the second light emitting element emit light. The second thin film transistor is arranged in the repair circuit, the second control end of the second thin film transistor is connected with the first capacitor, the second current output end is connected with the second light-emitting element, the on or off of the second thin film transistor can be controlled through the voltage change of the first capacitor, whether the second light-emitting element emits light or not is further controlled, and the purpose that the second light-emitting element changes in real time according to the light-emitting state of the first light-emitting element is achieved because the voltage in the first capacitor changes in real time according to the light-emitting state of the first light-emitting element.
In one embodiment, the plurality of thin film transistors further include a trigger thin film transistor, the trigger thin film transistor includes a trigger control terminal, a trigger input terminal, and a trigger output terminal, the second thin film transistor further includes a second current input terminal, the trigger control terminal is configured to control whether the trigger thin film transistor is turned on, the trigger input terminal is electrically connected to the power supply, the trigger output terminal is connected to the second current input terminal, and when the trigger thin film transistor is turned on, the power supply supplies power to the second light emitting element through the trigger thin film transistor to trigger the second light emitting element to emit light. By arranging the trigger thin film transistor in the repair circuit, when the first light-emitting element emits light, the repair circuit can be in a closed state by applying high level to the trigger control end; when the first light-emitting element does not emit light, the trigger thin film transistor can be turned on by applying low level to the trigger control end, so that the pixel circuit is switched from the main control circuit to the repair circuit, and the power supply supplies power to the second light-emitting element.
In one embodiment, the pixel circuit further includes a low voltage source, and the first light emitting element, the first capacitor, and the second light emitting element are connected to the low voltage source. The first light-emitting element, the first capacitor and the second light-emitting element are connected with a low-voltage source, so that voltage differences are formed among the negative electrodes and the positive electrodes of the first light-emitting element, the first capacitor and the second light-emitting element, and a current path is formed.
In one embodiment, the first thin film transistor and the trigger thin film transistor are both P-type thin film transistors, the second thin film transistor is an N-type thin film transistor, and the voltage threshold is determined according to the voltage of the low voltage source and the operating voltage of the first light emitting element. The first thin film transistor and the trigger thin film transistor are both of the type thin film transistors, the first thin film transistor and the trigger thin film transistor can be controlled to be switched on by applying control signals to the first thin film transistor and the trigger thin film transistor, so that the closing and opening states of the repair circuit are flexibly controlled, and the second thin film transistor is of the type thin film transistor, so that the voltage threshold of the second thin film transistor can be independently regulated and controlled, the repair circuit can be suitable for various types of pixel circuits, the transportability is high, and the cost is saved.
In one embodiment, the first control terminal is configured to be connected to a signal source to receive a first conducting signal, and the trigger control terminal is configured to be connected to a trigger signal source to receive a trigger signal, where the first thin film transistor is turned on when the first conducting signal is at a low level, and the trigger thin film transistor is turned on when the trigger signal is at a low level. The first thin film transistor is controlled to be switched on or off by applying a level signal to the first control end, and the trigger thin film transistor is controlled to be switched on or off by applying a level signal to the trigger control end, so that the aim of flexibly switching the repair circuit is fulfilled.
In one embodiment, the first thin film transistor is turned on, and the second thin film transistor is turned off, so that the repair circuit is in an off state when the first light emitting element emits light normally; when the first light-emitting element does not emit light, the first thin film transistor is switched off, and the second thin film transistor and the trigger thin film transistor are both switched on, so that the repair circuit is switched to a conducting state. By enabling the first thin film transistor to be conducted, the second thin film transistor and the trigger thin film transistor are conducted and disconnected differently according to the light emitting state of the first light emitting element, the automatic switching function of the repair circuit is achieved, and the repair efficiency is improved.
In one embodiment, the main control circuit includes a switching thin film transistor connected to a data line to control whether a data voltage is input to the pixel circuit, and a driving thin film transistor connected to the first light emitting element and the repair circuit to control whether the power supply supplies power to the first light emitting element or the repair circuit. The switching thin film transistor and the driving thin film transistor are arranged in the main control circuit, the switching thin film transistor is connected with the data line and the scanning line, and the purpose that whether the first light-emitting element and the second light-emitting element emit light or not and the light-emitting gray scale of the first light-emitting element and the second light-emitting element can be controlled through the main control circuit under the combined action of the switching thin film transistor and the driving thin film transistor is achieved.
Based on the same inventive concept, the present application also provides a display device including the pixel circuit according to any one of the above embodiments. By adopting the pixel circuit provided by the application in the display device, when a dark spot appears in the display device, the fault circuit can be automatically repaired, and the pixel circuit has the characteristics of high repairing speed and high efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a pixel circuit according to the embodiment of FIG. 1;
FIG. 3 is a timing diagram of an embodiment;
FIG. 4 is a schematic diagram of a pixel circuit according to another embodiment of FIG. 1;
FIG. 5 is a timing diagram of another embodiment;
FIG. 6 is a schematic diagram of a pixel circuit according to another embodiment of FIG. 1;
FIG. 7 is a timing diagram of another embodiment;
FIG. 8 is a schematic diagram of a pixel circuit according to another embodiment of FIG. 1;
FIG. 9 is a schematic diagram of a pixel circuit according to another embodiment of FIG. 1;
fig. 10 is a schematic structural diagram of a pixel circuit according to another embodiment of fig. 1.
Description of reference numerals:
10-a main control circuit; 20-repair circuit;
VDD-power supply; VSS-low voltage source; c1 — first capacitance; c2 — second capacitance; d1 — first light-emitting element; d2 — a second light-emitting element;
Data-Data lines; Scan-Scan line;
t1 — first thin film transistor; g1 — first control terminal; t11 — first current input; t12 — first current output;
t2 — a second thin film transistor; g2 — second control terminal; t21 — second current input; t22 — second current output;
t3-switching thin film transistor; g3 — third control terminal; t31 — third current input; t32 — third current output;
t4 — drive thin film transistor; g4-fourth control terminal; t41 — fourth current input; t42 — fourth current output;
an ET-trigger thin film transistor; ge-trigger control terminal; e1-trigger input; e2-trigger output.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The Micro-LED is formed by thinning, microminiaturizing and arraying an LED structure, the size is reduced to about 1-10 mu m, a protective layer and an electrode are completed by physical deposition after the LED structure is transferred onto a substrate in a large quantity, and then the Micro-LED is packaged to complete the display of the Micro-LED. The Micro-LED display has good stability and long service life, simultaneously has the advantages of low power consumption, high color saturation, high reaction speed, strong contrast and the like of the LED, and has wide application in the fields of wearable equipment, ultra-large display screens, wireless optical communication and the like. In the manufacturing process of the Micro-LED display panel, the LED chips need to be transferred from the respective growth substrates to the display panel. However, if any one of the LED chips is damaged or has poor contact, a bad point will appear on the display panel after transferring, which affects the imaging effect.
At present, the pixel circuit is mainly repaired by adopting laser repairing or IC switching, and the defect is that the repairing quantity increases exponentially along with the increase of the giant transfer area by adopting the laser repairing mode, so that the repairing efficiency is too low for products with higher resolution.
Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.
Referring to fig. 1, the present application provides a pixel circuit, which includes a main control circuit 10 and a power supply VDD, wherein the power supply VDD is connected to an input terminal of the main control circuit 10 to supply power to the main control circuit 10, and an output terminal of the main control circuit 10 is connected to a first light emitting device D1 to control the power supply VDD to supply power to a first light emitting device D1. When the main control circuit 10 is in the on state, the first power supply VDD inputs a power supply voltage to the main control circuit 10, and the power supply voltage supplies power to the first light emitting element D1 through the main control circuit 10. When the main control circuit 10 is in the off state, the power supply VDD does not supply power to the first light emitting element D1, and the first light emitting element D1 does not emit light.
Further, the pixel circuit provided by the embodiment of the present application further includes a repair circuit 20, and the repair circuit 20 is connected to the main control circuit 10 (as shown by a dashed line box in the figure), where the repair circuit 20 includes a plurality of thin film transistors, a first capacitor C1, and a second light emitting element D2, the plurality of thin film transistors are electrically connected to the main control circuit 10, the main control circuit 10 is configured to charge the first capacitor C1, and the first capacitor C1 is configured to discharge one of the thin film transistors. Specifically, an input terminal of the repair circuit 20 is connected to an output terminal of the main control circuit 10, so that the power supply VDD supplies power to the repair circuit 20. When the main control circuit 10 is in the on state and the first light emitting device D1 emits light normally, the power supply VDD charges the first capacitor C1 through the main control circuit 10 to store the voltage signal of the first light emitting device D1 emitting light normally in the first capacitor C1, the repair circuit 20 turns off the repair circuit 20 according to the voltage signal in the first capacitor C1, and the second light emitting device D2 does not emit light. When the main control circuit 10 is in the on state, but the first light emitting device D1 does not emit light due to a large amount of transfer failure or falling off, the first capacitor C1 discharges to control one of the tfts to be turned on, and in combination with the on and off cooperation of the other tfts, the power VDD supplies power to the second light emitting device D2 to cause the second light emitting device D2 to emit light, thereby repairing a dark spot generated when the first light emitting device D1 does not emit light.
By arranging the repair circuit 20 in the pixel circuit, and the repair circuit 20 comprises a plurality of thin film transistors, a first capacitor C1 and a second light emitting element D2, when the first light emitting element D1 does not emit light, the plurality of thin film transistors and the first capacitor C1 act together to switch the pixel circuit to the repair circuit 20, so that the second light emitting element D2 emits light, thereby solving the dark spot problem caused by the failure of the first light emitting element D1 in the mass transfer process, and completing automatic switching without external action, thereby greatly improving the repair efficiency.
In one embodiment, referring to fig. 1, the main control circuit 10 includes a switching thin film transistor T3 and a driving thin film transistor T4, the switching thin film transistor T3 is connected to the Data line Data to control whether the Data voltage is input to the pixel circuit, and the driving thin film transistor T4 is connected to the first light emitting element D1 and the repair circuit 20 to control whether the power source VDD supplies power to the first light emitting element D1 or the repair circuit 20. Specifically, the switching thin film transistor T3 includes a third control terminal G3, a third current input terminal T31 and a third current output terminal T32, the third control terminal G3 is connected to the Scan line Scan to receive the Scan signal, and the switching thin film transistor T3 switches between an on state and an off state according to the Scan signal. The third current input terminal T31 is connected to the Data line Data to receive a Data signal to input a Data voltage into the pixel circuit. The driving thin film transistor T4 includes a fourth control terminal G4, a fourth current input terminal T41 and a fourth current output terminal T42, the fourth current input terminal T41 is connected to the power source VDD, and the fourth current output terminal T42 is connected to the first light emitting element D1. In addition, the control circuit 10 further includes a second capacitor C2, an upper plate of the second capacitor C2 is connected to the power supply VDD, and a lower plate of the second capacitor C2, the third current output terminal T32 and the third control terminal G3 are all connected to the same node.
When the switching thin film transistor T3 is controlled to be turned on by the Scan signal transmitted through the Data line Scan, the Data line Data inputs a Data voltage through the switching thin film transistor T3, and the Data voltage charges the second capacitor C2 to store the Data voltage in the second capacitor C2. The data voltage is used to control the conduction degree of the driving thin film transistor T4, so as to control the current inputted from the power source VDD to the driving transistor T4, and further, to control the gray scales of the light emitted from the first light emitting element D1 and the second light emitting element D2. In addition, when the driving thin film transistor T4 is turned off, neither the first light emitting element D1 nor the second light emitting element D2 can emit light. By arranging the switching thin film transistor T3 and the driving thin film transistor T4 in the main control circuit 10, connecting the switching thin film transistor T3 with the Data line Data and the Scan line Scan, and by the combined action of the switching thin film transistor T3 and the driving thin film transistor T4, the main control circuit 10 can control whether the first light emitting element D1 and the second light emitting element D2 emit light and the light emitting gray scale thereof.
In one embodiment, referring to fig. 2 and 3, the plurality of thin film transistors includes a first thin film transistor T1, the first thin film transistor T1 includes a first control terminal G1, a first current input terminal T11 and a first current output terminal T12, and the first control terminal G1 is used for controlling whether the first thin film transistor T1 is turned on or not. Specifically, the first control terminal G1 is connected to a signal source for receiving a first on signal, as shown in fig. 2, when the first on signal is low, the first thin film transistor T1 is turned on, and when the first on signal is high, the first thin film transistor T1 is turned off. The first current input terminal T11 is electrically connected to a power source VDD, the first current output terminal T12 is connected to a first capacitor C1, when the first thin film transistor T1 is turned on, the power source VDD charges the first capacitor C1 through the first thin film transistor T1 to store a voltage signal of a light emitting state of the first light emitting element D1 in the first capacitor C1, when the first light emitting element D1 does not emit light, the first thin film transistor T1 is turned off to space the first capacitor C1 from the main control circuit 10, the power source VDD stops charging the first capacitor C1, and at this time, the charge in the first capacitor C1 is discharged in the repair circuit 20 to light the second light emitting element D2. By providing the first thin film transistor T1 in the repair circuit 20, the first thin film transistor T1 is turned on or off according to the light emitting state of the first light emitting element D1 to connect or disconnect the first capacitor C1 to the main control circuit 10, so that the first capacitor C1 is charged by the power supply VDD when the first light emitting element D1 emits light, and the second light emitting element D2 is caused to emit light by the first capacitor C1 being discharged when the first light emitting element D1 does not emit light, thereby repairing the pixel circuit.
In one embodiment, referring to fig. 1, the plurality of tfts further includes a second tft T2, the second tft T2 includes a second control terminal G2 and a second current output terminal T22, the second control terminal G2 is connected to the first capacitor C1, the second current output terminal T22 is connected to the second light emitting device D2, the second tft T2 has a voltage threshold, and when the voltage between the second current output terminal T22 and the second control terminal G2 is greater than the voltage threshold, the second tft T2 is turned on to enable the second light emitting device D2 to emit light. Specifically, the voltage threshold is the turn-on voltage of the second thin film transistor T2, when the first light emitting element D1 is turned from the light emitting state to the non-light emitting state, the voltage stored in the first capacitor C1 makes the upper plate of the first capacitor C1 still in the high potential state, when the second thin film transistor T2 is in the off state, the second current output terminal T22 is in the low potential state, at this time, the first capacitor C1 discharges to the second control terminal G2 of the second thin film transistor T2, when the voltage between the second current output terminal T22 and the second control terminal G2 is greater than the voltage threshold, that is, the voltage between the second current output terminal T22 and the second control terminal G2 is greater than the turn-on voltage of the second thin film transistor T2, the second thin film transistor T2 is turned on, so that the power supply VDD supplies power to the second light emitting element D2. By providing the second thin film transistor T2 in the repair circuit 20, and connecting the second control terminal G2 of the second thin film transistor T2 to the first capacitor C1, and connecting the second current output terminal T22 to the second light emitting element D2, the on/off of the second thin film transistor T2 can be controlled by the voltage change of the first capacitor C1, and whether the second light emitting element D2 emits light is further controlled, and since the voltage in the first capacitor C1 changes in real time according to the light emitting state of the first light emitting element D1, the purpose of changing the second light emitting element D2 in real time according to the light emitting state of the first light emitting element D1 is achieved.
In an embodiment, referring to fig. 1 and 7, the plurality of thin film transistors further includes a trigger thin film transistor ET, the trigger thin film transistor ET includes a trigger control terminal Ge, a trigger input terminal E1 and a trigger output terminal E2, the second thin film transistor T2 further includes a second current input terminal T21, the trigger control terminal Ge is used for controlling whether the trigger thin film transistor ET is turned on, the trigger input terminal E1 is electrically connected to a power supply VDD, the trigger output terminal E2 is connected to the second current input terminal T21, and when the trigger thin film transistor ET is turned on, the power supply VDD supplies power to the second light emitting element D2 through the trigger thin film transistor ET to trigger the second light emitting element D2 to emit light. The trigger control terminal GE is connected to the trigger signal source to receive the trigger signal, and as shown in fig. 7, when the trigger signal is at a low level, the thin film transistor ET is triggered to be turned on. Specifically, when the first light emitting element D1 does not emit light, the trigger control terminal GE is applied with a low level trigger signal to turn on the trigger thin film transistor ET, and the power supply VDD inputs a current to the repair circuit 20 through the trigger thin film transistor ET, so that the repair circuit 20 is fully turned on, thereby supplying power to the second light emitting element D2 and triggering the second light emitting element D2 to emit light. By providing the trigger thin film transistor ET in the repair circuit 20, when the first light emitting element D1 emits light, the repair circuit 20 can be in an off state by applying a high level to the trigger control terminal Ge; when the first light emitting element D1 does not emit light, the trigger thin film transistor ET is turned on by applying a low level to the trigger control terminal Ge, so that the pixel circuit is switched from the main control circuit 10 to the repair circuit 20, and the power supply VDD supplies power to the second light emitting element D2.
In one embodiment, referring to fig. 1, the pixel circuit further includes a low voltage source VSS, and the first light emitting device D1, the first capacitor C1 and the second light emitting device D2 are all connected to the low voltage source VSS. Specifically, the negative terminal of the first light emitting element D1, the lower plate of the first capacitor C1, and the negative terminal of the second light emitting element D2 are all connected to a low voltage source VSS, which is typically a low level signal, such as 0V, ground or other low level signal. The current path is formed by connecting the first light emitting element D1, the first capacitor C1, and the second light emitting element D2 to the low voltage source VSS, so that voltage differences are formed between the cathodes and the anodes of the first light emitting element D1, the first capacitor C1, and the second light emitting element D2.
In one embodiment, referring to fig. 6 and 7, the first tft T1 and the trigger tft ET are both P-type tfts, the second tft T2 is an N-type tft, and the voltage threshold of the second tft T2 is determined according to the voltage of the low voltage source VSS and the operating voltage of the first light emitting device D1. Specifically, the first thin film transistor T1 is a P-type thin film transistor, and the first thin film transistor T1 can be controlled to be turned on or off by inputting a level signal to the first control terminal G1 of the first thin film transistor T1. Similarly, the triggering thin film transistor ET is a P-type thin film transistor, and the triggering thin film transistor ET can be controlled to be turned on or off by applying a level signal to the triggering control terminal Ge of the triggering thin film transistor ET. The second thin film transistor T2 is an N-type thin film transistor, and since the types of the N-type thin film transistors are different, the voltage threshold thereof can be individually controlled without affecting the characteristics of the pixel circuit. The following description will be made by taking an example in which the voltage of the positive electrode of the first light emitting element D1 is in the corresponding voltage range of 0 to 255 gray scales, and the voltage fluctuation is-1V to 1V. The current input end and the control end of the N-type thin film transistor are equipotential, namely the equipotential of the second current input end T21 and the second control end G2 is-1V. Since the voltage drop across the second light emitting element D2 is small, the potential of the second current output terminal T22 in the open state can be approximately equal to the low voltage source VSS. At this time, the voltage threshold of the second thin film transistor T2 is determined to be | VSS | -1V, when VSS is-2.9V, the voltage threshold is about 1.9V, determined by the upper limit voltage of the second control terminal G2 being 1V. In other embodiments, the voltage threshold of the second thin film transistor T2 can be adjusted according to practical situations. By enabling the first thin film transistor T1 and the trigger thin film transistor ET to be P-type thin film transistors, the first thin film transistor T1 and the trigger thin film transistor ET can be controlled to be turned on by applying control signals to the first thin film transistor T1 and the trigger thin film transistor ET, so that the on and off states of the repair circuit 20 can be flexibly controlled, and the second thin film transistor T2 is an N-type thin film transistor, so that the voltage threshold of the second thin film transistor T2 can be independently regulated and controlled, so that the repair circuit can be applied to various types of pixel circuits, and is high in transportability, cost-saving, and favorable for improving the display integration level.
In one embodiment, the first thin film transistor T1 is turned on, and the second thin film transistor T2 is turned off, so that the repair circuit 20 is in an off state when the first light emitting element D1 emits light normally; when the first light emitting element D1 does not emit light, the first thin film transistor T1 is turned off, and the second thin film transistor T2 and the trigger thin film transistor ET are both turned on, so that the repair circuit 20 is switched to an on state. By turning on the first thin film transistor T1, the second thin film transistor T2 and the trigger thin film transistor ET are turned on and off differently according to the light emitting state of the first light emitting element D1, so that the automatic switching function of the repair circuit 20 is realized, and the repair efficiency is improved.
The repair process of the pixel circuit will be explained as follows:
referring to fig. 2 and 3, when the first light emitting device D1 emits light normally, the scan signal inputted from the third control terminal G3 is a low level signal, and the first control terminal G1 and the trigger control terminal G3 both input high level signals, the switching thin film transistor T3 is turned on, and the Data lines Data write Data signals into the main control circuit 10. The first thin film transistor T1 and the trigger thin film transistor ET are both turned off, and the repair circuit 10 is in an off state.
Referring to fig. 4 and 5, when the first light emitting device D1 is still in the light emitting state, a high level signal is input to the third control terminal G3 and the trigger control terminal Ge, and a low level signal is input to the first control terminal G1, the switching thin film transistor T3 and the trigger thin film transistor ET are both turned off. At this time, the first thin film transistor T1 is turned on to store the voltage signal of the first light emitting element D1 emitting light normally into the first capacitor C1, in preparation for the next state determination.
Referring to fig. 6 and 7, when the first light emitting device D1 emits light normally, a high level signal is input to both the third control terminal G3 and the first control terminal G1, and a low level signal is input to the trigger control terminal G3, the switching thin film transistor T1 is turned off, the first thin film transistor T1 and the second thin film transistor T2 are also turned off, and the triggering thin film transistor ET is turned on, at this time, since the second thin film transistor T2 is turned off, the power VDD cannot supply power to the second light emitting device D2, and thus the repair circuit 20 is still in an off state.
Referring to fig. 3 and 8, when the pixel circuit drops off during the process of transferring the LED in a large amount or due to other reasons, and the first light emitting element D1 does not emit light, a low level signal is input to the third control terminal G3, and a high level signal is input to the first control terminal G1 and the trigger control terminal Ge, so that the switching thin film transistor T3 is turned on, and the first thin film transistor T1 and the trigger thin film transistor ET are turned off. At this time, the data signal is written into the main control circuit 10 through the switching thin film transistor T3, and thus cannot form a loop. At this time, the potential of the positive electrode node of the first light emitting element D1 is equal to the potential of the power supply VDD.
Referring to fig. 5 and 9, when the first light emitting device D1 does not emit light, the first light emitting device D1 is in an off state, and at this time, the first capacitor C1 is charged by the power VDD and the low voltage terminal VSS, and the top plate of the first capacitor C1 is at a high potential approximately equal to the power VDD, so as to prepare for the subsequent circuit switching operation.
Further, referring to fig. 7 and 10, a high level signal is input to the third control terminal G3 and the first control terminal G1, and a low level signal is input to the trigger control terminal Ge, so that the switching thin film transistor T3 and the first thin film transistor T1 are turned off, and the triggering thin film transistor ET is turned on. At this time, since the voltage stored in the second control terminal G2 of the second thin film transistor T2 is in a high potential state compared with the normal state, the second thin film transistor T2 is turned on, and the switching operation of the repair circuit 20 is completed.
Based on the same inventive concept, the present application also provides a display device including the pixel circuit according to any one of the above embodiments. The display device can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. By adopting the pixel circuit provided by the application in the display device, when a dark spot appears in the display device, the fault circuit can be automatically repaired, and the pixel circuit has the characteristics of high repairing speed and high efficiency.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A pixel circuit, comprising:
a main control circuit for controlling whether the first light emitting element emits light;
the repair circuit comprises a plurality of thin film transistors, a first capacitor and a second light-emitting element, the thin film transistors are electrically connected with the main control circuit, the main control circuit is used for charging the first capacitor, and the first capacitor is used for discharging one of the thin film transistors; and
a power supply for supplying power to the main control circuit and the repair circuit;
when the first light-emitting element emits light, the power supply charges the first capacitor through the main control circuit;
when the first light-emitting element does not emit light, the first capacitor discharges to control one of the thin film transistors to be turned on, and the power supply supplies power to the second light-emitting element through the plurality of thin film transistors so as to enable the second light-emitting element to emit light.
2. The pixel circuit according to claim 1, wherein the plurality of thin film transistors includes a first thin film transistor, the first thin film transistor includes a first control terminal, a first current input terminal, and a first current output terminal, the first control terminal is configured to control whether the first thin film transistor is turned on, the first current input terminal is electrically connected to the power supply, the first current output terminal is connected to the first capacitor, and when the first thin film transistor is turned on, the power supply charges the first capacitor through the first thin film transistor.
3. The pixel circuit according to claim 2, wherein the plurality of thin film transistors further includes a second thin film transistor, the second thin film transistor includes a second control terminal and a second current output terminal, the second control terminal is connected to the first capacitor, the second current output terminal is connected to the second light emitting element, the second thin film transistor has a voltage threshold, and when a voltage between the second control terminal and the second current output terminal is greater than the voltage threshold, the second thin film transistor is turned on to cause the second light emitting element to emit light.
4. The pixel circuit according to claim 3, wherein the plurality of thin film transistors further includes a trigger thin film transistor, the trigger thin film transistor includes a trigger control terminal, a trigger input terminal, and a trigger output terminal, the second thin film transistor further includes a second current input terminal, the trigger control terminal is configured to control whether the trigger thin film transistor is turned on, the trigger input terminal is electrically connected to the power supply, the trigger output terminal is connected to the second current input terminal, and when the trigger thin film transistor is turned on, the power supply supplies power to the second light emitting element through the trigger thin film transistor to trigger the second light emitting element to emit light.
5. The pixel circuit according to claim 4, further comprising a low voltage source, wherein the first light emitting element, the first capacitor, and the second light emitting element are all connected to the low voltage source.
6. The pixel circuit according to claim 5, wherein the first thin film transistor and the trigger thin film transistor are both P-type thin film transistors, the second thin film transistor is an N-type thin film transistor, and the magnitude of the voltage threshold is determined according to the voltage of the low voltage source and the operating voltage of the first light emitting element.
7. The pixel circuit according to claim 4, wherein the first control terminal is configured to be connected to a signal source for receiving a first conducting signal, and the trigger control terminal is configured to be connected to a trigger signal source for receiving a trigger signal, and wherein the first thin film transistor is turned on when the first conducting signal is at a low level, and the trigger thin film transistor is turned on when the trigger signal is at a low level.
8. The pixel circuit according to claim 7, wherein the repair circuit is in an off state when the first thin film transistor is turned on and the second thin film transistor is turned off to normally emit light from the first light emitting element; when the first light-emitting element does not emit light, the first thin film transistor is switched off, and the second thin film transistor and the trigger thin film transistor are both switched on, so that the repair circuit is switched to a conducting state.
9. The pixel circuit according to claim 1, wherein the main control circuit includes a switching thin film transistor connected to a data line to control whether a data voltage is input to the pixel circuit, and a driving thin film transistor connected to the first light emitting element and the repair circuit to control whether the power source supplies power to the first light emitting element or the repair circuit.
10. A display device comprising the pixel circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120814162.4U CN214541526U (en) | 2021-04-20 | 2021-04-20 | Pixel circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120814162.4U CN214541526U (en) | 2021-04-20 | 2021-04-20 | Pixel circuit and display device |
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| CN214541526U true CN214541526U (en) | 2021-10-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114023255A (en) * | 2021-11-22 | 2022-02-08 | 惠州视维新技术有限公司 | Drive circuit, drive device, and display device |
| CN115206227A (en) * | 2022-05-18 | 2022-10-18 | 惠科股份有限公司 | Driving circuit of pixel unit and display panel |
| CN115831979A (en) * | 2022-12-21 | 2023-03-21 | 惠科股份有限公司 | Array substrate, manufacturing method, pixel driving circuit and display panel |
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2021
- 2021-04-20 CN CN202120814162.4U patent/CN214541526U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114023255A (en) * | 2021-11-22 | 2022-02-08 | 惠州视维新技术有限公司 | Drive circuit, drive device, and display device |
| CN115206227A (en) * | 2022-05-18 | 2022-10-18 | 惠科股份有限公司 | Driving circuit of pixel unit and display panel |
| CN115831979A (en) * | 2022-12-21 | 2023-03-21 | 惠科股份有限公司 | Array substrate, manufacturing method, pixel driving circuit and display panel |
| CN115831979B (en) * | 2022-12-21 | 2023-09-08 | 惠科股份有限公司 | Array substrate, manufacturing method, pixel driving circuit and display panel |
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